Laserfiche WebLink
<br />flood more than 1.0 foot at any point. Typical relation- <br />ships between the floodway and the floodway fringe and <br />their significance to flood plain development are shown <br />in Figure 11. <br /> <br />I. <br /> <br />100 YEAR FLOOD PLAIN <br /> <br />.1 <br /> <br />FLDODWAY <br />FRINGE <br /> <br />FLOODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />. <br />. <br /> <br /> <br />FLOOD ELEVATION WHEN <br /> <br />ENCRO:::~:~: WITrHIN FLOODWAY <br /> <br />-r <br /> <br /> <br />,: <br /> <br />--- <br />-~- <br /> <br /> <br />ENCROACHMENT <br />I <br /> <br />~ <br /> <br />AREA OF FLOODPLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />LINE A, B IS THE FLOOD ELEVATION BEFORE ENCROACHMENT <br />LINE C, D IS THE FLOOD ELEVATION AFTER ENCROACHMENT <br /> <br />'SURCHARGE NOT TO EXCEED 1,0 FOOT IFIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 11. <br /> <br />Floodway Schematic <br /> <br />5.0 <br /> <br />INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, the Federal <br />Insurance Administration has developed a process to transform <br />the data from the engineering study into flood insurance cri- <br />teria. This. process includes the determination of reaches, <br />Flood Hazard: Factors, and flood insurance zone designations <br />for each flooding source studied in detail affecting the <br />City of Longmont. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as lengths of watercourses having <br />relatively the same flood hazard, based on the average <br />weighted difference in water-surface elevations between <br /> <br />25 <br /> <br /> <br />